Get laughs with The Big Bang Theory t-shirt "Knock Knock Knock Penny" in black. Every fan just waits for Sheldon to knock on Penny's door during an episode. Choose this 100% cotton The Big Bang Theory TV show t-shirt in men's sizes small to XXL to let everyone know you follow The Big Bang Theory's brilliant physicists, Leonard and Sheldon, as they not only explore how the universe works, but more importantly, how to interact with people — especially women.

This shirt is a Christmas gift for a friend, so I can't rate the fit or quality of it. It is very clever since my name is Penny and he continually knocks 3 times and says my name. I can say that it was a great bargain.